Concrete mixer



W. E. DUNN ET AL 001403211: MIXER Filed Feb. 16 '1920 5 sheets-sheet; 1

T Tv5 Feb. 27, 1923.

W. E. DUNN ET AL CONCRETE MIXER OWN, T N ND U D ...l| V N E 4 mm. x, m 8WH 7 w 5 z 6 6 5 M? w J M ii I 1 a w m v w w i u 1 6 M llclll 17 l lll lm a x a a m l Feb. 27, 1923. 1,447,125

w. E. DUNN ET AL.

CONCRETE MIXERl Filed Feb. '16, 1920 5 sh eets-sheet I5 INVENTORSWILLIAM EDUNN HARRY E.DUNN

Feb. 27, 1923. 1,447,125

W. E. DUNN ET AL CONCRETE MIXER I Filed Feb. 16, 1920 5 sheets-sheet 476 INVENTORS WILLIAM EDUNN mo HARRY E.DUNN

ATTYS.

Feb. 27, 1923. 1,447,125-

W. E. DUNN ET AL CONCRETE MIXER Filed Feb .16, 1920 5 sheets-sheet 5Fred INVENTORS WILLIAM E. DUNN HARRY E.Dum-|,

Patented Feb. 27, 1923.

UNITED s T ier 1,447,125 tries.

WILLIAM E. DUNN AND HAIR-RY E. DUNN, OF HOLLAND, MICHIGAN CONCRETEApplicationfiled February 16,1320. Serial l\'l'o.,3 5 3, 8 1.5, i

To all whom it mayconcem Be it known that we,- Wmnren and HARRY E. DUNN,respectively c tizens of the United States and the Dominion of Canada,and residing at Holland, in the county of Ottawa, in the State'olMichigan, have invented. certain new and useful I mprovements in aConcrete Mixer, of which the following is a specification,

Our invention-relates to improvements .111 apparatus for mixing cementand aggregates for the production of concrete prior to ts being used forthe divers purposes in Which concrete is usually employed.

One ofthe objects otour present invention is the provision of a concretemixer thatihas the mixing compartment constructed withits bottom in asubstantially horizontal plane and rotatable about a central axis, Withshovels or blades positioned ithin said mixing compartment upon linedbrackets but disposed at divers angles of inclination to the axis of themixing compartment and at divers angles to the walls of: the mixingcompartment. Another object or" our invention is the provision in aconcrete mixing apparatus of suitable novel instrumentalities forcontrolling the discharge of the aggregates or mined elements tt'rom themixing compartment :and With the cooperation of the mixingshovels orblades to substantially clean :out the mixing compartment of its mixtureWhenever desired. Another object is the provision of-suitab'le'means forelevating and feeding the ingredients or elements to the mixingcompartment which structure is adapted to be operated automatically todump and, discharge at the proper times. ln'connect-ion withtheimixingstructure and :the elevating and feeding apparatus .We have devisedSLlllifllJlQ driving mechanism WlIlCll is under athe control of theoperator and -is adapted to actuate either the oneor the'other of saidmechanisms separately. or :both of them simultaneously. We have alsodesigneda suitable clutch mechanism in connectionrwith our apparatustor-causing-ithe divers parts to beput-into operation.

Qther objects which will be obvious to others skilled inthis artcomprise the provision of a concrete *miner and'its associated operatedby comparatively unskilled WOIkmen, which :is economical to.operateandiniexpensiae t manufacture. and, "Vi hi h i effecti e per ormn he v ns eectieas ing had to the accompanying drawings which form-apartof this specification, in which, i

I Figure is. a vertical .elevationof .our, improved concrete mixerlooking vat it fromone of the sides to discloseaportion of the vele.

vating and feeding mechanism.

Figure 2 is a vertical elevation thereof looking at the, structure atsubstantially right angles .to Figure 1, the adjacent half of the Wallof the mixing chamber being re moved" for clearness as Well as some ofthe structure infront ofv said chamber.

Figure .3 is .a perspective view of'theinterior of the mixing chambershovving the relative disposition ofthe mixing and dis,- chargingshovels. g

Figure 4: is a detail fragmentary View of the elevating and feedingbuciket and. the means for locking the same.

Figure 5 is anenlargeddetailvietv of one face of the clutch disk.

Figure 6 is T a similar view of the opposite face thereof.,and

Figure 7 is a detail view inpartialseotion showing the mannerotoperat-ing the clutch.

Figure 8'is a bottom .plan ofthe mixing compartment.

Figure 9 is atop plan of the intermediate rectangular supportingplatfiorm detached,

topof a -suitablewconcrete molding machine or other apparatus orlocality .rjvheize i-itrgis convenient "to :have (theconcreteldelivered. Itvvillv be understood however that-our apparatus is.also --W8ll adapted :for .use onl-ja ground or floor :level, andtheillustration herein merely typifies one of-themany uses ofour-apparatus Standards =1'0. preferably .fourin number,

provide ,\;a support i'or a platfo m "11 iihrit .isin a'hcrizontal planeveelllaheae theme trally provided with a connectingmember of: a circularor annular shape and has a ball-race or groove 16 in its upper face inwhich anti-triction balls 1? are placed. luternally of the connectingmember 15 is an angle-sha 'ied ring 18 arranged concentrically therewithand connected thereto by webs 19 so that the ring 13 is spacedtherefrom.

a slight distance. A cylindrical conduit 20 is movably secured to theflange of ring;- l8 and leads downwardly either straight or at an angleas shown in the drawing. This conduit 20 is rotatable and provides themeans for conveying the ct icretc and a ggregates to the proper ordesired place.

The mixing compartment preferably coinprises a bottom 21 of circularape, having a downturned peripheral flange to which the verticalcylindrical wall 1..., is secured. The bottom 21. preferably. i invertedconical shape or inclined towards the center which is provided with acentral. discharge opening 24. Concentric with. opening 24 is a ballraceor grooved flange that alines with and arranged in apposition with theballrace or groove 16 in the connecting; frame, whereby he mixing?compartn'ient is supported upon the and friction rollers or balls. aswill be under stood. Outside the ball-race 25 is an annular toothed rack26 that is engaged by a bevel pinion 27 carried upon the adjacent end ofa short drive shaft 253. lhis drive shaft 28 is journaled in suitablebearings 29 in the adjacent i l-shaped frame and etc tends outside saidbearingswhere an ac tuatingpulley 30 is secured to it. which pulleyderives its motion from a belt or other suitable source of power.

The central opening 24: in the bottom oi" the mixing compa .nent is keptnormally covered by a conical shaped cap 31 carried upon the lower endof a vertically reciprocatory rod 32 that is journaled intermediate itsends and adapted to slide in a bearing 33 mounted upon and between thehorizontal cross-rails 13. The means for moving; the cap to uncover theopening;- comprises a lever 34; tulcrumed adjacentone end upon a shortbracket 35 secured to and arising: from one of the cross-rails 13. Thelonger end of lever 34 is raised and lowered. by a nea /n25 rock-shaft36 the outer end'whereof has a lateral arm 37 that is actuated orreciprocated by an operating rod or handle The movable end of theshorter arm of lever 34: is bifurcated, the arms 39 whee" ol? extendupon opposite sides of rod 3.4-

anrl are pii'otally connected thereto. in order to prevent the cementand aggr rates f om being dumped onto this bearing 3-1 we have provideda small conical shaped. shield ll) that its down adjacent the bearing 33when the cap 31 is in .a lowerei'l position to cover the opening: in thecompartment. Carried upon the cross-sills 13. preferably over one of theI i-shaped end uprights is a water tank 41 connected in any suitablemanner with a water supply and provided upon its interior with anysuitable or well known t ue of: float valve for cutting oil the supplyof wa when i the tank has been nlled to a predetermined point (notshown). 'lhis is tor the purpose of permitting; the workman or operatorto simply pull a chain, rod,-or the lil when it is desired to supply themixing: corioaitment with water and upon so doing: the tank 41. willdischarge into the mi 5 coinparument the desired quantity of? WHLGI forthe batch of cement and aggregates tl'iat have'been mixed, after whichthe tank will immediately ro-iill to its predetermined l ,rel. in orderto agitate and thoroughly mix the cement and aggregates. both before andutter the discharge of water into the coinpartment, we have provided aplurali y of shovels or scoops which. in addition to per forming hebefore-nientioncd functions, as adapted when the cap 3'l. has uncoveredthe central opening in the compartment. to scoop scrape the centralopening in the compartnient to scrape or scoop the mixture or batchtoward the center and cause the same to be dischar ed through theopening 24. and at the ea '18 time effectively scrape oil the surfaceot'the bottom. [is shown in the drawi these shovels are carried upo'nthelower ends of brackets -12. l3, l4. and 4.5 that are peudently securedto the cross-rails in any suitable manner. We have that p i through thelatter and through longiti inaliy elongated slots in the of the shovelblades at an angle to throw the material towards the center while one ofthe blades is disposed so as to direct the material from the centertowards the wall of the mixer. .lhe exact disposition of these bladesnot important except that it will shown the brackets connected. to thecross-rails by bolts be borne in mind that they should accomplish thedischarge of the material from the mixer as well as the thorough mixingthereof. As seen inthe drawings, wehave provided upon the bracket 43 ashovel 47 that is relatively low to permit, the aggregates to tumbleover the same and this shovel, together with shovels48 and 49 carriedupon brackets 42 and 45, respectively, are so arranged, that theaggregates are tumbled ,or scooped toward the center, and the shovel 50on bracket 44 is only. slightly inclined to the vertical and isdisposedso as to move the mixture away fromthe center toward th wall ofthe compartment.

The means for feeding the aggregates and cement to the mixer,especially, when the mixing apparatus is mounted upon an elevatedplatform, comprises a lift or elevator structure, the bucket whereof israised and lowered in ,a suitable frame or carrier through suitableinstrumentalities that are driven by the drive-shaft. Uprights -51 ofangle metalare secured to the platform 11 and extend a suitable,distance above the cross-rails 13 and inclined parallel guides 52 ofchannel beams extend from the ground or fio'or up to and are secured tothe upper ends of the standards 51. The guides 52 have their channelsfacing each other, and the upper ends of the uprightsand guides areconnected by a cross-piece'comprising a pair of channel irons 53arranged with their backs facing, each other and spaced a slightdistance apart to permit of the mountingof a pair of grooved pulleys 54and 55. A suitable frame 56 of rectangular shape is provided forcarrying the bucket 57, and has small blocks 58 upon the exterior of itsvertical members. These blocks fit into the facing grooves or channelsof the inclined members 52 so that the frame and the bucket may beguided in their up and down movements. The bucket 57 is provided withtrunnions 59 in its lower portion that fit into bearings. 60 on theframe which places the -enter of gravity of the bucket and its contentsin a plane to one side of the trunnions and toward the mixer. In orderto lock the bucket in a substantially upright position, we have provideda suitable latch which is adapted to hold the bucket stationary in theframe during itselevationand to be released when the bucket and framereach the proper level for dumping the ag gregates into the mixer. Thislatch consists of a bell-crank, one arm 61 whereof is provided with ahook-shaped end to engage a stud 62 on the bucket. The bell-crank ispivoted at the angle formed by its arms on a bracket 63 carried by thecarrier frame and the other arm 64 preferably extendsdowm wardly and hasa lateral member 65 project- 3 ing therefrom in the plane of a cam orboss 66 passes down under a pulley 68 journaledfin r the upper member ofthe elevator frame-and then passes up over pulleys 54 and 55 and thencedown to a winding sheave or drum.

69 carried on the extended and of a shaft 70 journaled in bearings in.the. supporting frame for the mixer. The opposite'end of shaft 70' has agear. 71 mounted loosely on it that is in mesh with a pinion 72 fixedlyisecured to the main drive-shaft 28.

A-clutch mechanism is employed to lock the gear 71 to its shaft 70,which clutch mechanism is operated by a horizontallydisposed rod 73 thatis reciprocated longitudinally by a hook-shaped lever or actuating arm74 pivoted to the frame of the appara tus and one end whereof extendsdownwithin convenient reach of the operator.

Thisv clutch mechanism comprises a hollow drum or flange "7 5 madeintegral with 01" secured to the acent side of the gear '1';

71. Secured to the shaft 70 by any suitable means is a disk or circularplate 76 provided with a central hub to strengthen it at its point ofattachment tothe shaft.

Set eccentrically in the inner face ofthe disk is a stub or' pintle 77upon which are pivoted substantially semi-circular segments 78 ofthe-expanding band which are of 'L-sec tion and the cylindrical orflange portions opposite their pivoted ends are bent inwardly to formlugs 79 having opposingfaces. The segments are retained in a normallycontracted position by means of, helical springs 80 passing between andsecured to the adjacent ends of the respective segments. The

disk 76 is bored at a point substantially diametrically opposite to thelocation of the stub 77 for the receipt" of a shorter stub shaft 81extending upon both sides ofthe disk and to the inner end of which isfixedly secured an elongated block or cam 82 the smallest diameter ofwhich is such ,as'to snugly fit between the inwardly bent opposing facesof the lugs 7 9 when the segments 78 are in normal-or contracted posi--'tion. On the other endofcs'tub-s-haft 81 is fixedly secured a curved orcrescentshapied i lever arm 82 the movable "end whereof is: boredandtapped to receive a bolt 83 dis-- posed substantially radially of theshaft 70 and the end of which bolt nearest the shaft. is provided with aheaded end 84 and which maybe securedxin desired relation to the leverarm by a lockenut 85 Surrounding the shaft and movable longitudinallythereon is a collar 86 having an inclined or conical end portion 8'?which is adapted to be moved to engage the headed end 8% oi: the boltthereby moving or rocking the lever arm 82 and rotating the stub-shaft81 which in turn rotates the elongated block or cam 82 and expands thesemi-circular segments 78 into engagement with the inner face of theflange off the drum thus causing the movement of the gear 7'1 to betransmitted to the shaft 70.

By operating the clutch mechanism just described suiiiciently hard theshaft may be rotated with suiiicient force to elevate the bucket withits contents, and by operating the clutch lightly so that some degreeoi? slippage is permitted it may be employed to retain the bucket anydesired elevated position or to act as a brake in permitting the descentof the bucket.

A clutch mechanism. substantialy similar in all respects with that justdescribed, is provided. upon the end or" the main. drive-- shaft 2-8 toconnect the power pulley 3O thereto and therefore need not again bedescribed. The drum 88- in this instance is of course a. part of thepulley 30 while the. disk 89 and the collar 90 are carried upon androtate with said drive-shaft 28. The lever 91 pivoted to the supportingframe. is employed for movin the collar to permit its beveled portion toengage the segmental shaped lever-arm operate the segments inside thedrum. Also we have provided a suitable brake mechanism for retarding thereverse rotation oi shaft 70 and the lowerin g of the bucket whichcomprises a drum 92 pendently secured to rail l l of the connectingplatform so that shaft 70 passes axially therethrough. A collar 93 ismoved longitudinally on shaft 70 by a lateral member 9% carried on theadjacent portion of rod 73 so that said collar will cause the actuationof the brake element inside the drum. When rod 73 is moved to throw thegear clutch collar 93 moves away from the brake element permitting therotation of shaft 70, and vice versa when the gear clutch is releasedcollar 93 actuates the brake elements and slows down or stops therotation of shaft 70, and thus controlling the move ment of the bucket.

What we claim as new is 1. A concrete mixer comprising a cylindricalcasing having its axis in a vertical plane, a concaved bottom thereforhaving a discharge port in its lowest portion; said structure adapted tobe rotated upon a vertical axis, and a plurality of stationary shovelspositioned in said casing adjacent said bottom disposed at divers anglesto the axis of rotation of said bottom whereby the material operatedupon is moved transversely of the direction of rotation includingupwardly from said bottom and towards the center o1" said bottom.

2. A concrete mixer comprising a cylindrical casing having its axis in avertical plane, a bottom therefor having a discharge port in its lowerportion; said structure adapted to be rotated upon a vertical axis, aplurality of stationary shovels positioned in said casing adjacent saidbottom disposed at divers angles to the axis of rotation of said bottomwhereby the material operated upon is moved transversely of thedirection of rotation and towards said central discharge port, and avertically movable coni cal shaped cap extending above said bottom andadapted to cover and uncover said discharge port and to co-operate inclosed posi* tion with said shovels in turning said materials.

3. A concrete mixer comprising a cylindrical casing having its axis in avertical plane, a bottom therefor having a discharge port in its lowerportion; said structure adapted to be rotated upon a vertical axis, aplurality of stationary shovels positioned in said casing adjacent saidbottom disposed at divers angles to the axis of rotation of said bottomwhereby the material operated upon is moved transversely of thedirection of rotation and towards said central discharge port, a conicalshaped cap extending above said bottom and coacting with said dischargeport, and means for moving said cap vertically to cover and uncover saidport.

d. A concrete mixer comprising a cylindrical casing having its axis in avertical plane, a conical bottom therefor having a discharge port in itslower portion; said structure adapt-ed to be rotated upon a verticalaxis, a rotatable and vertically movable cap extending above said bottomfor controlling said discharge port, a plurality of stationary shovelspositioned in said casing ad'- jacent said bottom disposed at diversangles to the axis of rotation of said bottom whereby the materialoperated upon is moved. transversely oi? the direction of rotation, asupporting frame in which said structure is mounted having a horizontalmember extending transversely above said casing on which said shovelsare pendently mounted, and means for rotating said casing and bottom.

5. A concrete mixing structure comprising a rotatable cylindrical casingconsisting of side and bottom walls the latter whereof is provided witha central discharge opening, a conical closure for said openingextending above said bottom, fixed shovels extended into said casing andpositioned adjacent said bottom, said shovels inclined at divers andopposing angles'to the direction of rotation of said casing whereby thema- 7 terial being mixed is moved generally towards said conical closureand is tumbled upwardly into the strata of material above the bottomstratum. v

6. In a concrete mixer comprising a suit able support, a cylindricalcasing revolvably mounted thereon, a downwardly concaved bottom for saidcasing having a discharge port in its lower portion, a conical shapedclosure for said port extending above said bottom, a verticalreciprocable spindle upon which said closure is mounted, a leverfulcrumed intermediate its ends upon said support, and means coactingwith the ends of said lever and said spindle whereby the movement ofsaid lever is transmitted to said spindle to open and closesaid closure.

7. In a concrete mixer comprising a suitable support, a cylindricalcasing revolvably mounted thereon, a bottom for said casing having adischarge portin its lower portion, a conical shaped closure for saidopening extending above said bottom, a vertical reciprocable spindleupon which said Closureis mounted, a rock-shaft journaled upon saidsupport, a lever upon said rock shaft the outer end whereof engages aprojecting portion of said spindle, and means for rocking said shaft. 8.A concrete mixer comprising a cylindrical casing having its axis in avertical plane, a concaved bottom therefor having a discharge port inits lowest portion,

lateral means for rotating said structure about a vertical axis wherebysaid discharge port is unobstructed, a plurality of stationary shovelspositioned in said casing adj acent said bottom disposed at diversangles to the axis of rotation of said bottom whereby the materialoperated upon is moved transversely of the direction of rotationinclining upwardly from said bottom and towards the center ofsaidbottom. v 9. A concrete mixer comprising a cylindrical casing havingits axis in a vertical plane, a concaved bottom therefor having adischarge port in its lowest portion, bearings concentric with saiddischarge port and r0-- tatably supporting said structure, meansexterlor to SaICl bearlngs for rotating said structure, whereby'saiddischarge port is unobstructed, a plurality] of stationary shovelspositioned in said casing adjacent said bottom disposed at divers anglesto the axis of rotation of said bottom whereby the material operatedupon is moved trans-i versely of the direction of rotation incliningupwardly from said bottom and toward the'center thereof.

Signed at Holland, county of Ottawa, and State of Michigan, this 9th dayof February, 1920,

. LLIAM E. DUNN, v

' l-IARRY E. DUNN. Witnesses:

WM. ARMDsHoso'r, BURT L. Foam.

